Some Utils methods moved to core.common.FileSystem.
Utils.Buffers / etc moved to core.io.Buffers.
Clear dead code from core.Utils
Moved core.Xdg to core.common.Xdg.
Moved core.Utils to core.common.Utils.
Move Settings code into sub packages.
Moved core.Sprite to core.graphics.Sprite.
Moved core.Bitmap to core.graphics.Bitmap.